I am a ooga booga vivarium caveman rn i got 3 big water containers no clue how much water per container. Only filters i got are algae's doe i migth get one i gotta do more research. The first two vivariums are from a single river the third one however is just a big misc of anything ive collected yet. First vivarium is a mostly snail/dancing worms (no idea what the actual name of the "dancing worms" are but its a kind of common river nematode they can get about an inch long and they transparent they just eat dirt and kinda look they dancing pieces of hair) there used to be a kind of round shrimp thing too be they went extinct. Second vivarium has a small population of dancing worms but is mostly habited by multiple small "things" (idk) not too sure what they are but are different kinds of swimming dot things that seem to maybe filter or detritus feeders also there are a couple hydras and some small shrimps. Last vivarium is full of algea and a bunch of more river beasties doe also some aquarium krill and algea's also one big non parasitic leech that keeps the snail population in control. I was thinking of getting some more colorfull shrimps or snails maybe a crab